jPDFNotes is a Java bean component which can be integrated into Java applications or deployed on the Web in an applet or using Java Web start. It allows users to mark up, review, and annotate PDF documents online. Most PDF annotations and features are supported, including graphical, sound, free text, typewriter, measurements (distance, perimeter, and area), file attachments, and bookmarks. All PDF fonts are supported (Types 0-3, OpenType, and TrueType).

JFileUpload is a Java applet that allows you to upload files and folders to any Web or FTP server. It can be integrated into any application. The server-side technology could be JSP/Servlet, PHP, Coldfusion, CGI, or Microsoft ASP. The front-end provides an upload progress bar, a cancel button, and drag and drop support.

RunPON establishes a network connection by calling the pon/poff scripts.
It periodically checks that a given interface is still active. It can
run as a stand-alone application, as a status icon (in the tray), or as
a GNOME panel applet.

JFileUpload is a Java applet that allows uploading of files and folders to any Web or FTP server. This component can be integrated into any application, whether the server-side technology is JSP/Servlet, PHP, Coldfusion, CGI, or Microsoft ASP. The front-end provides an upload progress bar, a cancel button, and drag-and-drop support. JFileUpload supports very large uploads over 2GB and can resume broken uploads. Its colors, size, and language can be customized.

Compa is a GNOME panel applet which can display the output of any system
command on the panel. It can also display the output of a different
command in its tooltip, and launch a different command when clicked. The
text style can be modified using the Text Attribute Markup Language.

tmux-applets is a collection of tmux "applets" that are designed to be used in tmux's status bar. They are non-textual, using blocks of color instead. Currently, there are two applets provided. tmux-cpu-freq displays the CPU frequency level as colored blocks, and tmux-ping, which tries to ping a host and displays success or failure as a colored block.

ClassicMenu Indicator is a notification area applet (application indicator) for the top panel of Ubuntu's Unity desktop environment. It provides a simple way to get a classic GNOME-style application menu for those who prefer this over the Unity dash menu. Like the classic GNOME menu, it includes Wine games and applications if you have those installed.